Geotechnical study in Puebla de Don Fadrique

In Puebla de Don Fadrique, limestone, dolomite and marble substrata predominate, accounting for close to 59% of the local soil types. These materials generally provide a good bearing capacity for shallow foundations, although the occasional presence of fine sands and silts, as well as compacted gravels and sands, may introduce localised changes that need to be analysed in the field campaign. The formations show low permeability, but surface aquifers may exist at favourable levels; therefore, it is essential to confirm hydraulic stability before carrying out foundations.

Seismicity in the area shows 79 events over the last three decades, with a maximum magnitude (Mmax) of 3.7, corresponding to a noticeable level which, although not critical, warrants consideration in design. The geological setting also implies the possible development of karstification in the carbonate materials; this factor must be verified in detail before the start of the works to avoid unexpected differential settlements. As the substratum is non-clayey, the risk of expansiveness is ruled out, so the most relevant constraint is the possible presence of karst cavities associated with the dominant materials.